Call Center Headset Headphones +Adjustable Volume + Mute Control For Phone AVAYA Lucent 6402D 6408D+ 6416D+M 6424D+M 8403 8410D 8434DX 4406D+ 4412D+4424D+4424LD+2410 2420 4610 4620 4621 5410 Telephone Direct Connect Over The Head Headset, No Additional Applifiers / Adapters Required. Built-In volume adjustable and mute button control. Shirt clip included. Soft Leathered Ear Cushions For All Day Comfort. Superior Quality Sound with the Flexible Adjustable Microphone. Headband Style with Single Earpiece for Great Sound Quality in One Ear